
respectively.
Then [1]}, [2]},
\( \nonumber I(A:B|S) = \frac{1}{2}\log (2\pi e)^2 \det (\Gamma _{as}) + \frac{1}{2}\log (2\pi e)^2 \det (\Gamma _{bs}) - \frac{1}{2}\log (2\pi e) \det (\Gamma _s) - \frac{1}{2}\log (2\pi e)^3 \det (\Gamma _{abs}) \,.  \) 
